[Tagging] Is there a good way to indicate "pushing bicycle not allowed here"?

Paul Allen pla16021 at gmail.com
Thu Jul 23 15:55:17 UTC 2020

On Thu, 23 Jul 2020 at 16:35, Matthew Woehlke <mwoehlke.floss at gmail.com>

Well off-topic now.

(OT: Airline transponders may be IFF — note the capitalization —
> although I wonder about that because I always think of IFF as more a
> military thing. I'm not sure if civilian transponders are really meant
> to *identify friend or foe*, or if they're more just "transponders".)

Transponders on civil aircraft implement a subset of the military
Mark XII IFF system.  This is no coincidence: military aircraft
should treat civilian aircraft as friendly...  Mode S (civilian)
and mode 5 (encrypted version of mode S for the military)
are used by TCAS to avoid collisions.  So civilian
transponders are IFF systems with restricted capabilities.

This is probably not a suitable place to discuss this further.

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